Analysis for shaping the ITER first wall
Analysis for shaping the ITER first wall
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DOI：
10.1016/j.jnucmat.2009.01.249
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发表时间：
2009-06
影响因子：
3.1
通讯作者：
P. Stangeby;R. Mitteau
中科院分区：
文献类型：
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作者：
P. Stangeby;R. Mitteau
ITER与现有设备的一个根本区别是需要屏蔽14 MeV的中子。这对等离子体启动/降压(SU/RD)以及保护第一壁免受等离子体接触具有重大影响。这导致了设计决定：(A)不在吸氮毯子前面放置单独的壁面限制器结构，(B)将毯子模块化为∼400型远程操作兼容毯子模块(BM)，以及(C)塑造BMS的正面以用于等离子接触。这里考虑了内壁和外壁的组合保护-SU/RD选项，以实现最佳成型。不幸的是，BM系统的模块化(BM间间隙和不对齐)需要对BM表面进行整形，从而使峰值功率负载相对于理想(连续、圆形)墙体限制器增加∼10倍。幸运的是，这个水平仍然可以接受，∼为2 mW/m2，即使对于7 mW的su/d功率也是如此。
A fundamental difference between ITER and present devices is the need to shield against 14MeV neutrons. This has major consequences for plasma start-up/rampdown (su/rd) and also for protecting the first wall from plasma contact. This has led to design decisions: (a) not to place in front of the n-absorbing blanket a separate wall-limiter structure, (b) to modularize the blanket into ∼400 remote handling compatible blanket modules (BM), and (c) to shape the front face of the BMs for plasma contact. Combined protection-su/rd options are considered here for the inner and outer wall with regard to optimal shaping. Unfortunately, the modularity of the BM system (inter-BM gaps and misalignments) requires shaping of the BM faces that increases peak power loads by ∼10× relative to the ideal (continuous, circular) wall-limiter. Fortunately, the level may still be acceptable, ∼2MW/m2, even for su/rd power of 7 MW.